[llvm] InstCombine/Select: remove redundant code (NFC) (PR #112388)

[Ramkumar Ramachandra via llvm-commits]

artagnon wrote:

> Could you please point to which simplification is the subsuming one? Is it foldSelectICmpEq?

I'm not sure: I just realized that the code wasn't covered by tests, so I wrote the tests covering it; I removed the code and the tests were still passing. Will investigate more in the morning.

https://github.com/llvm/llvm-project/pull/112388